Page 27 - Strands of Evidence Hair And Fiber
P. 27
the red truck evidence sheet. Ensure that your
Sample sample’s identification code is recorded.
Characterization
3. Place your data collection sheet and labeled
slides into evidence.
1. Place a sample onto the microscope stage.
Adjust and focus the scope to examine the
mounted strand.
Sample
2. Using Step 1 on the handout Hair and Fiber Comparison
Identification, determine whether your sample
is a hair or a fiber.
1. Select a bag of evidence collected at the
3. Choose the appropriate RED data collection murder scene and remove the included strand.
sheet for your sample, depending on whether it
is a hair or a fiber. 2. Create a cast and mount of the evidence from
that envelope on a microscope slide in the
4. Continue to use the handout to fill in all of the same fashion as with the samples removed
spaces on the data collection sheet. from the evidence tape.
5. Adjust your microscope to analyze the cast you 3. Choose an appropriate GREEN data collection
prepared of the outside of the hair or fiber. sheet, depending on whether your sample is a
hair or a fiber.
6. Sketch the observered cast features on your
data collection sheet. 4. Characterize the sample utilizing the same
method used for those collected from the truck
7. With a permanent marker, label this slide with and record your findings and sketches on your
the sample identification code located on the data collection sheet.
data collection sheet you are using for this
sample. 5. Refer to the red truck evidence sheet, and
determine if any of the samples previously
entered have descriptions similar to the current
sample.
Entering Samples
into Evidence 6. If no similar samples are found, record your
current sample on the No Match sheet provided
by your instructor. Proceed with step fifteen.
1. Your instructor will have a space to enter
samples into evidence. There will be different 7. If a sample that appears similar is found, collect
places to enter human hairs, animal hairs, and that sample’s data collection sheet and slide.
textile fibers.
8. Check this sample out of evidence by putting its
2. For each of your samples, copy the information identification code, your initials, and the check-
required from your data collection sheet onto out time on the evidence check out sheet.
THE MYSTERY OF LYLE AND LOUISE 27
